Grinding finishing machine plates



`(No Model.) 2 Sheets-Sheet, 1. H. F. OASE.

GRINDIG PINISHING MACHINE PLATES.

No. 269,915. Patented Jan.2, 1883.

PETERS. molvumngnpnu wnhingum D. C.

(No Model.) 2 Sheets-Sheet 2.

H. F. CASE.

GRINDING PINISHING MACHINE PLATES.

Patented Jan. 2, 1883.

@flux if l N. PETERa Pnnmmhngnpher, wnsmngwn. D. c.

NTTED STATES PATENT Carton.

HENRY F. CASE, OF SOUTH MANCHESTER, CONNECTICUT, ASSIGNOR TO A. VELLES CASE AND A. WILLARD CASE, OF SAME PLACE.

GRINDING FINISHING-MACHINE PLATES.

SPECIFICATION forming part of Letters Patent No. 269,915, dated January 2, 1883.

Application filed November 7,'188-3. (No model.)

llo-all whom it may concern Beit known that I, HENRYF. CASE, of South Manchester, in the county of Hartford and State of Connecticut, have invented certain new and useful ImprovementsI in Grinding Ilinishing-Machine Plates, of which the following is a description, reference being had to the accompanying drawings, where- Figure l is a side view of a. finishing-mato chine with the pitman broken from the driving-crank, and parts in section. Fig. 2 is a view in horizontal section on plane denoted by line w x, Fig. l. Fig. 3 is a view in section of bevel-gear shaft on` plane y y, Fig. 2. Fig. 4.

t5 is a detail view of the grinder-holder and appartenant parts, showing partly in vertical section the grinder, shalt, and the handles by which the grinder may be moved laterally of the bed.

zo My invention relates to the art of papermaking, and especially to finishing of what is known as press-board.77 In this special producta tirm highly-polished surfaceis necessary, and it is produced by subjecting the board to pressure and lriction between a bed or pressplate and a roller that is passed rapidly over it.

My invention consists in improved devices for and method of facing or grinding the pressplate to the curve ofthe roller-arm, and for 3o regrinding the same after wear, the details of which are more fully hereinafter described.

In the accompanying drawings, the letter a denotes thefraineofafinishing-machineformed of any suitable material-as cast-iron strengthened by a brace, a,'and having a. bed, c, to which is secured, as by bolting, a press-plate, b, made preferabl y of cast-iron with y chilled face.

A roller-arm, c, is pivotally attached to a 4o cross-piece,d,nearitscenter. This cross-piece is tenoned at its ends, which are adapted to move in the upright parts ofthe frame et. The cross-piece is held in proper position by means ot' upright bolts e, which are secured 4to the tenoned ends, pass through guides fin the frame, and are screw-threaded to fit the nuts` g., The roller-arm c is provided at its lower end with a hardened-steel roll pivoted in a holder secured to the arm by bolts, and it is reciprocated across the press-plate by means of a pit- 5o man, 7i, which is pivoted to the arm, as at c', and to a crank at the other end, connected with any suitable source of power for finishing purposes.

The upper surface or face of the press-plate is made as nearly as possible to form acurved surface whose radius is equal to the distance from the center on which the arm swings to the lower edge of the periphery of the roller, plus thethicliness of the board or paper to be 6o finished.

It is essential to the proper working of the machine that there shall be an equal distance between the path of the roller-face and the plate from end to end of the latter, and that the curved surface ot' the plate and the curvedv path of the roller on the vibrating roller-arm shall be substantially concentric. To secure these results by o ld methods would be very expensive, if not impracticable; but by means 7o of my improvement I face the plate to fit any radius of roller-arm, the only care being to form, preferably by casting, the plate to very near the intended radius. To face the plate it is secured to the bed a, the roller-holder is removed from the arm, and in its place is bolted the holder i, which bears a shaft,j, to which are fastened a grinder, k, preferably of emery, and pulleys l l. This grinder lc is driven by belts l l' from pulleys m m, secured to a 8o shaft concentric with the pivot of the roller arm, and the latter pulley by belts from a main-shaft pulley belted to pulleys n it. The pitman is disconnected from the arm,.and a reversible feed device, o, horizontally pivoted to the frame a, and connected by guide-rod p and feed-screw g to the arm c. A shaft, r, in the feed device bears the bevel-cogs r r and the pulley r", which is driven by a belt from the main shaft. This crossshaft is longitudi- 9o nally movable in its bearings, and the gears r r are thrown into or out of mesh with the gear q by means of the .shifter s, having arms s' projecting below the edges of the gears. The feed-rod q passes through a nut which is horizontally pivoted at tr to a stand secured to the arm, and as the rod revolves the arm is drawn slowly along its path above the plate,

the cutter being rapidly revolved by means already shown, and also moved transversely of the plate by means of the handles on the end ofthe cutter-shaft. The transverse or lateral movementof the grinder is usually effected by the attendant workman. The cutter is less in thickness than the width of the pla-te` and its traversing motion across the plate in cutting insures a perfect surface on the latter. As soon as oneend of the plate is reached in the grinding operation the gears r 9^ are shil'ted anda reverse motion given to the feedrod q. The cutting is continued as long as is necessary to secure a perfect surface on the press-plate. rlhe cutter is then replaced by the roller, the feed device removed, the pitman connected to the arm, and the machine ready for its work in finishing.

Uy cutter and feed device is applicable to machines having different lengths of rollerarms, and works equally well within wide limits. By it new plates are trued for their function after being placed in the machine in which they are intended to remain, and are afterward reground by the same device whenever necessary.

The automatic reversal ot' the feed-screw and reciprocation of the cutter are evidently attainable by simple mechanical attachments to the above-described device.

The pressure of the roller upon the pressboard is adjustable by means ofthe rods @and nuts g to any desired degree.

I claim as my inventionl. In a press-board-tinishiug machine, a laterally-movable press-plate grinder, k, removably secured to the roller-arm, and moved on the press-plate, while cutting, by feed mechanism o, all substantially as described.

2. In combination, frame a, press-plate b, roller-arm c, frame t', bearing shat'tf and grinder k, and feed device 0, all substantially as described. l

3. In combination, frame u, press-plate b. arm c, bearing the rotary and laterally movable grinder 7a, vertically-adjustable cross`piece el, and feed device o, all substantially as described.

HENRY F. CASE.

Witnesses:

R. B. WATKINS, J. D. GoULDEN. 

